Nickel-chromium alloy and articles made therefrom



Patented Oct. 13, 1925.

UNITE*D STATES PATENT OFFICE.

WILLIAM. F. COGHRANE, F BALTIMORE, ASSIGNOR, BY MESNE ASSIGN- MENTS, TO U. S. INDUSTRIAL ALCOHOL 00., A CORPORATION 01' WEST VIRGINIA.

NICKEL-OHROMIUM ALLOY AND ARTICLES MADE 'IEEREFROM.

No Drawing.

To all whom it may concern:

Be it known that I, WILLIAM F. Coon- RANE, -a citizen of the United States, a resident of Baltimore, State of Maryland, have invented a certain new and useful Nickel-Chromium Alloy and Articles Made Therefrom, of which the following is a specification. 1

ihis invention relates to certain nickel chromium alloys and articles of manufacture made therefrom as, for example, various engine parts, engine valves, valve seats, disks and turbine blades.

It is an object of this invention to produce an alloy which shall have special properties,

among which are very high strength at elevated temperatures, resistance to corrosion and warping, and resistance to the action of superheated steam and sulfuric acid and various other acids, such as phosphoric acid,

and capacity to resist pittin when manufactured in the form of engine valves and other parts subjected to strain and high tem peratures.

It is a furtherobject to produce engine valves and various other engine parts from such alloys so that said parts will have superior wearing qualities and superior high temperature resistance than the valves hitherto manufactured.

Further objects of the invention will ap pear as the following description proceeds. in accordance with my invention I provide an alloy mix containingappmximately the following constituents inthe proportions named:

. Per cent. Nickel 25 to lO Chromium l to 5 iron l to 5 Manganese to 2%;

And the remainder copper;

Application filed July 17, 1924. Serial No. 726,462.

having the functions and advantages pre- And the remainder copper.

The nickel ma be reduced to although is or inarily as low as is desirable in such alloys,

The iron may be omitted and as illustrating such a mix the following is given:

Per cent. N lckel 20 to Chromium -1 to 5 Manganese 2 or below And the remainder copper.

The function of the manganese, is to a great extent, to act as a. dioxidizer.

Among the chief characteristics of this alloy are the relatively low nickel content, as compared with Monel metal, and the percentage of chromium. In other words, the 3,110 may be termed a nickel chromium alloy havi a relatively low percentage of nickel and a igh percentage of copper. Among the various advantages which such alloys possess may he mentioned their high strengthat elevated temperatures, such as 1000 F. The alloys when manufactured into various engine parts, as aforesaid, will, therefore, show very excellent properties in that there will be substantially no warping or weakening of the mechanical structure untii relatively high temperatures are reached. Furthermore, the allo s show excellent properties as regards pitting and they are non-corrosive, and are able to resist the action of superheated steam and acids. such as sulfuric and phosphoric acids. Such engine valves may be used for a long period of time without any necessity of being ground down in the manner practiced at the present time with engine valves of ordinary construction and com 'tion.

e allo described may also be used for the manu acture of parts and fittings for use in connection with superheated steam, for example, valve stems, valve disks, and valve seats. The alloys are also adapted for use in chemical work, as, for example, valves and shafting for agitators, etc.

While in the above description the advantages accruing from the use of such alloys for engine valves and various other parts have been specifically set forth, it will be understood that these alloys are likewise adapted for other uses and structures in As many apparently widely different emu-t,

bodiments of this invention may be made without departing from the spirit thereof, it is to be understood that I do not intend to limit myself to the specific embodiment thereof.

I claim:

1. An alloy which comprises chromium 1% to 5% nickel, 20% to 40%, and the balance large copper.

2. An all which comprises chromium, 1% to 5%, nickel, 20% to 40%, iron, 1% to 5%, and the balance copper.

3. An alloy which comprises chromium, 1% to 5%, nickel, 20% to 40%, a small proportion of a deoxidizer, and the balance copp 4. An alloy which comprises chromium, 1% to 5%, nickel, 20% to 40%, iron, 1% to 5%, a small proportion of a deoxidizer, and the balance copper.

5. An alloy which comprises chromium,

- 1% to 5%, nickel,25% to 40%, a small proportion of a deoxidizer, and the balance cop- 6. alloy which comprises 1% to 5% chromium, 20% to 40% nickel, below 5% of iron, and the balance copper, and which has the pro rty of maintaining its strength and elastic imit up to about 1000 F. without substantial impairment.

7. An engine part of ordinarilyl subjected to a high temperature and whic is composed of an alloy comprismg 1% to 5% chromium, 25% to 40% nickel, a small amount of deoxidizer, and 1% to 5% iron and copper.

8. An engine part of a character which is ordinarily subjected to a high temperature and which is composed of an alloy compris- 1ng 1% to 5% chromium, 25% to 40% nickel, a small amount of deoxidizer, and the balance copper.-

a character which is 9: An enginepart of a character which is:

ordinarily subjected to a high temperature and which is com sed of an alloy comprising 20% to 40% nickel, 1% to 5% chromium, and thelbalance cop r.

10. A valve for internal combustion engines made from an alloy comprising 20% to 40% nickel, 1% to 5% chromium, and the balance copper.-

11. A valve for internal combustion engines made from an alloy comprising 20% to 40% nickel, 1% to 15% chromium, and the balance copper.

12. A valve for internal combustion engines made from an alloy comprising 20% to 40% nickel, 1% to 15% chromium, and substantially free from iron.

13. An alloy which comprises chromium 1% to 15%, nickel 20% to 40%, and the balance largely copper.

In testimony that-I claim the foregoing, I have hereunto set my hand this 19th day of June, 1924.

WILLIAM F. COCHRANE. 

